The Robe of Incanus [2,+20]
+3 to INT, WIS, Searching
Resist Acid, Lightning, Fire, Cold
Sustain INT, WIS
Free Action; Levitation; See Invisible; Decrease Mana Consumption Rate
Activates for a mana bolt (120) every 120+d120 turns
Level 50, Rarity 40, 2.0 lbs, 100000 Gold

(Hengband 1.6.0)